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Is there a quick test to detect the presence of iron sulfide in aggregates? The aggregate I am considering will be used in an exposed decorative application, so repeated wetting and drying of the aggregate will occur at the surface. I also am concerned it may cause staining.

My dispatcher received a phone from a residential neighbor who just had a new driveway placed. ItÆs been stained with various oils from workersÆ construction vehicles. Can we use a 1400-psi washer we use to clean our equipment for this purpose? And after the cleaning is there a sealer this neighbor...

As we were about to start production of the prestressed members for a new job, an engineer from the testing lab inspected the steel strand. He rejected it because it was too rusty. Is there a way to determine whether rusting will have a harmful effect on strand performance?